|
|
Testing of surfactants for copolymerization of acrylic monomers
Novotný, Igor ; Arvai, Tomáš (referee) ; Kučera, František (advisor)
The Bachelor thesis deals with testing effect of surfactants for preparing acrylate copolymers of methyl methacrylate and butyl arylate via emulsion copolymerization. The effect of concentration of surfactant used to rate of copolymerization during copolymerization was investigated. By DLS was measured particle size and relative average molecular weight was determinate via capillary viscometer for characterization of prepared copolymers. Data acquired from measurements were compared and analyzed if it has some contribution when surfactants are mixed together.
|
|
|
Influence of stabilizers and other components on final quality of mixtures for ice-cream production
Sládková, Veronika ; Obruča, Stanislav (referee) ; Márová, Ivana (advisor)
Presented diploma thesis was focused on study of influence of stabilizers and other components on final quality of mixtures for ice-cream production. This thesis was worked out in cooperation with Frujo Co., Ltd., Tvrdonice to find out the most suitable stabilizer with positive influence on the quality of final product. In experimental part six mixtures of stabilizers, three mixtures for ice-cream production and particular ingredients for production of mixtures for ice-cream production were analysed. Saccharides and lipids were analysed only in mixtures of stabilizers. Content of saccharides was analyzed using spectrophotometry and HPLC/RI. Lipid components were analysed by TLC. Viscosity was measured by rotatory viscosimeter and the differences of flow curves of each mixture with different stabilizers were monitored. Based on viscosity measurements some ice-creams with different stabilizers were chosen for sensory analysis. Mixture of stabilizers “Stobicol” was analysed for active compounds and antioxidant stability. Microbiological stability was tested in all of the stabilizers and also in particular ingredients including final mixture for ice-cream production. In three ice-cream mixtures of different flavour protein composition was measured by microfluidic electrophoresis. The highest content of total and reducing saccharides was determined in hydrolyzed samples. The highest values of total saccharides were found in mixture of stabilizers “Meyprogen”, the highest values of reducing saccharides were detected in stabilizer “Swissgum”. Content of triglycerides was found out almost in all of the measured mixtures of stabilizers using TLC method even though according to formulas provided by producers there should not be any. Diglycerides were detected in “Meyprogen” too even though this mixture of stabilizers should contain only saccharides. Based on results of rheology measurements and in connection with sensory analysis “Meyprogen” stabilizer could be recommended as the best material for the industrial production.
|
|
|
Testing of surfactants for copolymerization of acrylic monomers
Novotný, Igor ; Arvai, Tomáš (referee) ; Kučera, František (advisor)
The Bachelor thesis deals with testing effect of surfactants for preparing acrylate copolymers of methyl methacrylate and butyl arylate via emulsion copolymerization. The effect of concentration of surfactant used to rate of copolymerization during copolymerization was investigated. By DLS was measured particle size and relative average molecular weight was determinate via capillary viscometer for characterization of prepared copolymers. Data acquired from measurements were compared and analyzed if it has some contribution when surfactants are mixed together.
|
|
|
Influence of stabilizers and other components on final quality of mixtures for ice-cream production
Sládková, Veronika ; Obruča, Stanislav (referee) ; Márová, Ivana (advisor)
Presented diploma thesis was focused on study of influence of stabilizers and other components on final quality of mixtures for ice-cream production. This thesis was worked out in cooperation with Frujo Co., Ltd., Tvrdonice to find out the most suitable stabilizer with positive influence on the quality of final product. In experimental part six mixtures of stabilizers, three mixtures for ice-cream production and particular ingredients for production of mixtures for ice-cream production were analysed. Saccharides and lipids were analysed only in mixtures of stabilizers. Content of saccharides was analyzed using spectrophotometry and HPLC/RI. Lipid components were analysed by TLC. Viscosity was measured by rotatory viscosimeter and the differences of flow curves of each mixture with different stabilizers were monitored. Based on viscosity measurements some ice-creams with different stabilizers were chosen for sensory analysis. Mixture of stabilizers “Stobicol” was analysed for active compounds and antioxidant stability. Microbiological stability was tested in all of the stabilizers and also in particular ingredients including final mixture for ice-cream production. In three ice-cream mixtures of different flavour protein composition was measured by microfluidic electrophoresis. The highest content of total and reducing saccharides was determined in hydrolyzed samples. The highest values of total saccharides were found in mixture of stabilizers “Meyprogen”, the highest values of reducing saccharides were detected in stabilizer “Swissgum”. Content of triglycerides was found out almost in all of the measured mixtures of stabilizers using TLC method even though according to formulas provided by producers there should not be any. Diglycerides were detected in “Meyprogen” too even though this mixture of stabilizers should contain only saccharides. Based on results of rheology measurements and in connection with sensory analysis “Meyprogen” stabilizer could be recommended as the best material for the industrial production.
|
guest ::
